Maybe this has been covered previously, but I can't find any threads on this specific subject.

I've paid my GE fee, been interviewed, and approved, and have received my KTN. But as a passenger on mostly non-US aircraft, as well as on U.S. military aircraft, I don't receive TSA Pre✓ because neither group are "participating carriers".

Why even have this TSA-driven combination of "KTN" and "participating airline"?

Why the discrimination against a GE "graduate" when flying any particular air service? One scan of my passport with correlation of stored GE data and TSA agents could be immediately aware that I'm "Global Entry approved and current".

Isn't the issue about MY PERSON and my being of low risk? Or am I suddenly of LESS risk when I choose a US commercial carrier and of GREATER risk when choosing Lufthansa or U.S. military aircraft?

(I'm hoping the answer is not simply "it has nothing to do with security and it's purely a method to favor US-based airlines or, worse yet, to favor airlines whose lobbyists lined someone's pockets early in the Pre✓ planning stages".)